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Total lung capacity and its subdivisions, maximal breathing capacity and forced expiratory volume in one second expressed as a percentage of the forced vital capacity, were measured in 130 male and 130 female normal Turkish subjects 8 to 20 years old to establish normal values. The subjects were from different socio-economic communities. Statistical analysis was performed to determine the relationship of the measurements to age and the physical characteristics of the body, and the best regression equations were found for predicting lung volumes and maximal breathing capacity. It was found that all physical characteristics were highly correlated with spirometric measurements. Best prediction formulae were found to be based on body surface area and height. All volumes and maximal breathing capacity were found, in general, to be higher in males. This sex difference in measurements became significant after 16-17 years of age. The difference in height between the two sexes also became significant after 16 years of age. In the same age group and in both sexes, taller subjects had higher lung volumes and maximal breathing capacity. These findings suggest that height and respiratory muscle power are the main factors of sex difference in the measurements. Vital capacity and maximal breathing capacity related to age in both sexes were compared with those of some previous studies and it was found that all data, except a few, fell within the 95% confidence limits of the present study. Similar observations were, in general, made when height was taken into consideration for comparison. The value of FEV1/FVC% was altered little for the age group studied and its mean value was about 8666+ 42% for males and 87+42% for females. There was no significant relationship between age or sex and RV/TLC% and the mean value of this parameter was 236 + 19 for males and 25 5 + 1-6 for females. There was a slight but clinically unimportant difference between the values of these two measurements and the value from the literature.Since both static and dynamic lung function measurements have become standard procedures in evaluating pulmonary dysfunction, normal values and prediction formulae for these measurements have been established in several countries. These show a rather wide variation in individual values about the mean or predicted values due to many factors, including the particular segment of population studied. Therefore, it was decided to establish normal values for Turkish -subjects. This report presents the data obtained for total lung capacity and its subdivisions, maximal breathing capacity and forced expiratory volume in one second, for normal Turkish subjects of both sexes, 8 to 20 years old. MATERIALS AND METHODSLung Lunction measurements were done on 130 male and 130 female subjects ranging in age from 8 to 20 years and taken from different economic and social communities, so that we felt that the whole population was represented. All were healthy and had no history of chronic respiratory or cardiac disease. The physical char...

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